Elias smith



(No Model.)

E.- SMITH.

INDUGTIUN ooIL.

Patented Oct. 11, 1887.,

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UNITED STATES PATENT OFFICE.

ELIAS SMITH, OF PEORIA, ILLINOIS, ASSIGNOR OF ONE-HALF TO FRED KIMBLE,OF SAME PLACE.

INDUCTION-COIL.

.SPECIFICATION forming part of Letters Patent No. 371,524, dated Cctoberl1, 1887.

Application filed July 1, 1887. Serial No. 243,109.

To aZZ whom t may concern.;

Be it known that I, ELIAS SMITH, a citizen of theUnited States, residingat Peoria, in the county of Peoria and State of Illinois, have inventedcertain new and useful Improvements in Electrical Apparatus for DentalPurposes; and I do hereby declare that the following is a full, clear,and exact description of the invention, which will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to an electrical apparatus and its application todentistry, and has for its object to produce means whereby a current ofelectricity may be'used with advantage to deaden the pain caused bydental operations. s

The invention further has for its object to produce means whereby thecurrent readily may be regulated, and whereby, also, the current may becut oft' instantly by the operator when desired.

Vith these objects in view the invention consists in the aggroupments ofparts now to be described, and particularly pointed out in the claims.

I have illustrated the invention in the accompanying drawings, in whichFigure I is a perspective view ot the exterior of thev case which Iemploy to hold the batteries, 85e., employed in my invention. Fig. 2 isa side elevation ofthe interior ot the case, showing the `parts inposition, one side of the case being broken away. Fig. 3 is a detailView showing the manner of mounting and adjusting the armature of theinduction-coil. Fig. 4 is a view showing the inner face of the board orplate upon which the induction-coil is mounted, illustrating theconnections between the induction-coil and the discharges; and Figs. 5and 6 represent modified forms of tightening devices designed to beapplied to the spring carrying the armature of the induction- (Nomodel.)

B. l/Vithin this case A is mounted one or more cells, O C, which may bethe well-known carbon or any other desirable cell. The elements of thesecells are, for convenience in raising them from the jars, connected to atransverse bar, D, which is provided with a vertical rod, E, projectingthrough the top of the shell or ease, so that by raising or lowering therod the elements are Withdrawn from or lowered into the liquid in thejars. The cells are connected to the binding-posts E F, Xed to aboard,G, upon which the inductioncoil is mounted. The post F is connected bymeans of the wire H to the adjustable contactscrew I, against whichbears the spring J, and the binding-post E is suitably connected withthe primary of the induction-Coil. The purpose of this screw I is, inconnection with the spring J, to break and make the primary circuit,andthe frequency ofthe impulsesis regulated by the tension ot' spring J.

The armature K of the y induction-coil is mounted at approximately thecenter ot' the spring J, so that the vibrations of the armature arevaried by the tension of the spring. The spring is mounted in projectingarms L M, projecting from a plate or bar, N, mounted insuitablerelationtotheinduction-coil. Oneend of the spring is connectedvpermanently to the arm L, and the other end is connected toa lever, O,mounted on the arm M.

The lever O is movable and is manipulated yby the screw P, which passesthrough the lever O and bears against the arm M, so that by turning thescrew the lever is moved away from the arm and any desired amount oftension is imposed upon the spring, and thus the rapidity with which thearmature vibrates is regulated.

Instead of the means for tightening the spring shown in Fig. 3, I' mayemploy one of the devices shown in Figs. 5 and 6 of the drawings.

In the form of tightener shown in Fig. 5 one end of the spring ispermanently connected to the arm L, and the other end is attached to ascrew which passes through the arm M, so that by turning the screw bac-kand forth tension may be put upon or taken off the spring.

In the form shown in Fig. 6 the free end of 1. In an 'electricalapparatus for dental purthe spring passes through the arm M, and isposes, a generator, an induction-coil having connected by a pin to aneccentric which bears against the arm, and by which the spring may betightened in an obvious manner.

The wires from the secondary of the ind uctioncoil are connected,respectively, tothe' binding-posts Q and R, and the post Q is connectedto the post S on the top of the case.

The core Sl of the induction-coil projects through the shell of theapparatus, as shown, for convenience in manipulating it.

The post R :is connected with a spring, U, ixed, preferably, at aboutthe bottom of the case. One end of this spring is fixed permanently,andthe free end bears, when in its normal position, against a metalplate, V. To the outside of the case is pivoted alever, W, provided witha knob or projection which projects through an opening in the side ofthe case the box or case rests upon the loor it may be pressed by thefoot of the operator, whether he be standing on the ooror on a stool.Pressure on the lever W will separate the spring U and metal plate, andthus break the circuit. The plate V is connected to a post, T, fixed tothe outside of the boxor case.

The cylindersor electrodes, designed to be held in the hands of theperson tobe operated upon are connected, respectively, to thebinding-posts T and S. The postT is connected with a binding-post, Y, bymeans of a wire, Z, and to this postis connected a pair of forceps orother instruments to be used in operating upon the patient.

In using the apparatus the electrodes are grasped by the patient and theelements of the batteries are lowered into the jars, thereby generatinga current of electricity whichpasses through the circuit completed bythe person holding the electrodes. When the forceps which are connected,asA described, with the post 'Y are brought into contactwith the tooth,a circuit through the forceps and tooth is completed, thus causing aportion of the current formerly passing through the hands holding itsarmature mounted on a spring fast at 011e/y end and secured at the otherto a lever and set-screw, whereby the rapidity of the elec,`

' trical impulses allowed to pass through the iuduction-coil isregulated, and the electrodes, substantially as described.

4. In an electrical apparatus for dental purposes, a generator, auinduction-coil, the electrodes, and the Wire from one of thedischargeposts connected with a pair of forcepsbr the like,substantially as described.

5. In an electrical apparatus for dental purposes, the elongated springU, forminga portion ofthe circuit, and the elongated lever W, mounted onthe exterior of the case, and having a projection extending through thecase and bearing against Vthe spring, substantiallyd as described.

6. The combination, in an electrical apparatus for dental purposes, ofone or more batterycells, an 4induction-coil having its armature mountedon a spring supported at bot-h ends and provided with a tension device,the electrodes, and the forceps or other instrument attached to one ofthe electrodes, substantially as described.

7. The combination, in an electrical apparatus, of one or more cells, aninductioncoil having its armature mounted on a spring supported at bothends and provided with-a tension device, the elongated spring formingVtnesses:

DAVID H. MEAD, A. KEITHLEY.

ELIAS SMITH.

